Method of producing box or container parts having alpha curved bottom



Aug. 1, 1933. J. SCHMIEDEL METHOD OF PRODUCING BOX OR CONTAINER PARTSHAVING A CURVED BOTTOM Fild Feb. 18, 1950 s sheets-sheet 1 Fig.2

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J. SCHMIEDEL Aug. 1, 1933.

. METHOD OF PRODUCING BOX OR CONTAINER PARTS HAVING- A GURVED BOTTOMFiled Feb. 18. 1930 3 Sheets-Sheet 3 Patented Aug. ll. @33

.lfohannes Schmiedel, Dresden, Ge is =1: ignor to the Firm lilniverseileGigaretteaschinenand in Germany February 26, 1929 8 Claims.

This invention relates to improvements in the production of the parts ofboxes or containers having a curved bottom.

In the production of boxes and particularly those which are providedwith lids and with a neck insert it is usual to give the lid a convexcurvature and also to provide it with impressions.

It has been proposed to form boxes first with a fiat bottom and a flatlid, to open them after they are completed and in this condition todeliver them to a stamping press which produces the curvature of thebottom of the lid and the necessary impressions. This known method hasthe disadvantage that it involves changing the shape of the alreadycompleted box, an operation which with fragile articles does not producea satisfactory product.

It has moreover been proposed to curve the blank as regards its bottomportion before production of the box and to apply the blank thus shapedto the completed under part and form it on this. This operation involvesgreat dificulty because the shaping of the lid portion on the neckinsert is naturally possible only when the lid portion is of fragilepaper and the neck insert of strong cardboard.

As distinguished therefrom the present method consists in shaping a boxblank already curved as regards its bottom portion in a shaping chan nelwith'the aid of a forming block adapted to be applied to the one sideflap and having a shape corresponding to the curvature. In this wayseparate box or container parts or even complete boxes can be producedwith and without neck. inserts in one operation and the curvature of theportion of the bottom of the box in question produced in a satisfactorymanner.

In apparatus intended for carrying the method into efiect a pile ofblanks is provided from which the blanks are delivered separately into apress for curving the bottom whereupon the blanks withthe bottom nowcurved are placed in front of a shaping channel or in frontof theforming block, the side ofthe shaping channel corresponding to thecurved side of the forming block being mounted resiliently.

The invention is illustrated in the accompanying. dra.wings in which IFig. 1 is a vertical longitudinal section through the apparatus, a

Figs. 2 and 3 show the shaping press in open condition in longitudinaland in cross section respectively, I

Fig. 4 shows the rectangular shaping channel 5 in section on the line1-4 or Fig. 1,

' blade spring 10 against the abutment 11 is pushed- Fig. 5 is avertical cross wction on the line 5-5 of Fig. l,

Fig. 6 is a plan view of Fig. i, the upper por tion of the shaping pressand the i0 lmzazi. block guide being omitted, go Fig. '2 shows the blankwith its ped bottom part.

Fig. 8 shows in perspective the formal employed. v

Fig. 9 is a sectional elevation showing the role as tive position of thedriving means about the subject matter of Fig. 1 of the drawings.

Fig. 10 is a detail longitudinal section showing the shaping press inopen condition and'inclliel= ing the blank feeding lug.

Fig. 11 is a section along line 11-41 of 123.

Fig. 12 is a sectional elevation siniilar to Fig. 4 showing in additionthereto actuating means for elements thereof.

Fig. 13 is a top plan view of the device shown in Fig. 9. v

Fig. id is a view similar to Fig. 3 showing added details of theactuating mechanism for elements thereof.

Fig. 15 is a perspective view of the completed box.

Fig. 16 is a lateral sectional pleted box.

Referring-to the drawings, the blanks Z0 are fed from the pile 1 to theshaping station W by means of a lug 2' on the plunger 2. e shaping meansconsists of a matrix 3 and a hollow die 4 which after the blank is inposition on the matrix presses on the side flaps oi the blank. Theshaping die 5 which is movable in the hollow die 4, now moves downwardsand forms the lid portion with a curved surface as shown in Fig. 7. Thelugs 6 provided on the plunger 2 now push the blank along the supportingbars 7 so that the front flap comes into position over theshaping'channel 8. At the same time the blank Zu intended to form thelower'part is view of the com -moved towards the blank forming the lid mtion by means of the plunger 9 so that the two blanksmeet midway overthe shapin channel 8.- After the neck strip Za is placed above thelunction of these blanks, the forming block F which is formed with asuitably'curved surface and V which mus inoperative position is pressedby a downwards by means of the plunger 12. The forming block firstcontacts with the neck strip and presses it against the end flaps 01'theblanks located over the shaping channel, the resiliently supportedcounter-plunger 13 i'orming anabut:

ment. 01. further downward movement of the plunger 12 the plunger 13 iscorrespondingly moved backwards and the blanks are given a U-shape. Inorder to ensure that the lid portion will fit properly around the curvedlid forming block the left hand channel wall 14 is arranged to pivot at15. A spring 16 bearing against the wall 14 presses the latter into theposition shown in Fig. 1, the hook shaped lug 14' on the wall 14 bearingagainst a pin 17. On passage of the box part through the channel theplate 14 is pressed backwards. On the passage of the forming block withthe work through the shaping channel 8 the four opposite side flaps arepressed at the same time by the folding cam members 8', 8 against theforming block. After the form ing block has moved with the work into theposition shown in dotted lines in Fig. 4 a plunger 18 moves forward andpushes it into the channel 19 where in known manner the still projectingends of the neck portion are folded by means-of a suitably actuatedprojection 20 and by a folding finger 21 projecting into the shapingchannel. The two upper side flaps' strike against bending bars 22 whichbend these side flaps against the forming block. The work passes fromthe channel 19 the bottom of which is formed by a resilient plate 19' toa device which in known manner provides it with a binding strip.

It should be noted that the one wall 19" of the channel 19 is shaped tocorrespond to the curvature of the lid portion. It should also be notedthat the plunger 2 as shown in Fig. 6 is provided at its forward forkedend with two lugs 6 which, at the time when the lugs 2' feed a new blankfrom the pile 1 to the shaping station W push the blank provided withits curved surface 1 forward on the supporting bars '7.

Actuation of the various movable elements-of the device may be effectedas follows:

The lug 2' which feeds the blanks Z0 from the pile 1 is actuated asfollows:-

A link 23 is pivotally joined to arm 2 of said lug and one end of alever 24. The latter is pivoted to the.machine frame 9 at 25. The otherend of lever 24 has a roller 26 which tracks a cam 27 keyed to a shaft34 which is driven in a manner to be presently described.

Lug 9 which feeds the blanks Zu from the pile 1' is actuated as follows:

A link 31 is pivotally connected to lug 9 and to one'end of a leverwhich latter is pivoted to the machine frame at 32. A link 28 ispivotally connected to lever 30 at 29 and to arm 24 at 24'. In thismanner motion of both lugs is accomplished by a single cam. It is, ofcourse, understood that lugs 2 and 9 are guided horizontally in suitablemanner.

1 Matrix die 3 is reciprocated vertically as folows:--

The matrix has a roller 36 mounted on an ex tension which tracks a cam46 keyed to a shaft 41.

Die 5 is actuated as'follo'wsz- The upper end of said die has tworollers 43 and 44 pivoted thereto in spaced relationship and between thesaid rollers a cam-42 is borne on a shaft 45 to which it is keyed.

Cams 42, and -46 are driven by means of a sprocket chain 86" whichpasses oversprocket wheels 3'7, 38"and 35 keyed respectively to shafts41,45and34.

guide 48 on an extension of the machine frame is actuated as follows:

A lever 50 pivotally engages projection 12' on plunger 12 by means of aforked end 50'. Said lever is pivoted to the machine extension at 49. Alink 51 is pivotally connected to lever 50 intermediate its ends andalso pivotally connected to a lever 53. The latter is pivoted at 52 tothe machine frame. Intermediate its ends said lever 53 has a roller 54which tracks a cam 55 keyed on shaft 34.

Plunger 13 which is slidably borne in guides 61 having a spring 62between guide 61 and its head, to retain it in raised position, and alateral projection 13 at the lower end of the lower guide 61 to preventit from being moved completely out of guides 61, is actuated asfollows:-

A lever is pivotally mounted at 59 to the machine frame. One end 60' ofsaid lever engages the projection 13. The other end of said lever isprovided with a roller 60 which tracks a cam 58 keyed on a shaft 5'7.

Suitable gearing 56 connects shafts 57 and 35 and either of the two maybe driven from a source not shown.

Plunger 18 which is slidably borne in the machine frame is actuated asfollows:-

A link is pivotally connected to said plunger and to one end of a lever'78. The latter is pivoted intermediate its ends at '79 to the machineframe. The free end of said lever has a cam roller 81 which tracks a camgroove '77 in a cam 7'7 keyed to shaft 57.

Finger 20 which is slidably borne on plunger 18 is actuated as follows:-

A link 72 pivotally engages said finger and one end of a lever '73. Thelatter is pivotally mounted to the machine frame at '74. The free end ofsaid lever has a roller '75 which tracks a cam groove '76 in a cam '76keyed to said shaft 5'7.

I claim:

1. A method of producing box or container parts having a curved faceconsisting in folding a box blank already curved as regards a portionthereof about a forming block having a wall whose shape corresponds tothe curved portion of said blank.

2. Apparatus for producing box or container parts having a curved facefrom box blanks'comprising a shaping press to 'curve a portion of eachof said blanks, means for feeding said blanks separately from a pile ofblanks into said shaping press, a shaping channel, a forming blockhaving a curved wall,-means for feeding said curved blanks from saidpress in front of said shaping channel, said shaping channel formed witha curved wall corresponding to the curvature of said forming block walland being resiliently mounted, and means for moving said curved blankand block through said channel to fold the blank about said block.

3. Apparatus for producing box or container parts having a curved facefrom box blanks comprising a shaping pressto curve a portion of each ofsaid blanks, means for, feeding said blanks separately from a pile ofblanks into the shaping press, a shaping channel, a forming block havinga curved wall; means -for feeding said curved blanks from said pressinfront of said shaping channel, said shaping channel'formed-wlth acurved wall corresponding to-the curvature of the forming block andbeing resiliently mounted; means for moving said curved blank and saidThe plunger 12 which is slidably borne in a block through said channelto fold the blank about three edges of said block and the curved face, asecond channel formed with a wall recessed to correspond to thecurvature of the bot-v tom, and means for moving said block andpartially folded blank through said second channel to complete thefolding of said blank about said block.

4. A methodof producing a box part having a curved face from a blank,including the step of curving a portion of said blank and then foldingsaid blank about a forming block having a curved wall to conform withthat of said blank, said curved portion being folded onto said curvedwall.

5. A method of producing a box having a curved face from two box blanks,comprising curving a portion of one of said blanks and thensimultaneously folding both blanks about a forming block having a curvedwall to conform with that of said previously curved blank, said curvedportion being molded onto said curved wall.

, 6. Apparatus for producing a box part having a curved wall from a boxblank comprising a shaping press for curvinga portion of said blank,meanswfor feeding blanks separately from a pile to said press, a shapingchannel, means for feeding said curved blanks from said press to aposito curve a portion of said blank including a sloping channel andmeans to fold said curved blank into box shape.

8. Apparatus for producing a box part having a curved wall from a boxblank comprising means to curve a portion of said blank, a forming blockhaving a curved wall to correspond to the curve imparted to said blankand means to fold said blank about said block into box shape, saidcurved portion of-saidblank being adapted to coincide with the curvedwall of said block.

JOHANNES SCHMJEDEL.

